add a funtion to convert BinaryData to RequestContent (Azure#39316)

* add serialize funtion for BinaryData

* add more test

* Update sdk/core/Azure.Core/src/Shared/RequestContentHelper.cs

Co-authored-by: Christopher Scott <[email protected]>

---------

Co-authored-by: Christopher Scott <[email protected]>

Author: chunyu3

sdk/core/Azure.Core/src/Shared/RequestContentHelper.cs

@@ -94,5 +94,15 @@ public static RequestContent FromObject(object value)
             content.JsonWriter.WriteObjectValue(value);
             return content;
         }
+        public static RequestContent FromObject(BinaryData value)
+        {
+            var content = new Utf8JsonRequestContent();
+#if NET6_0_OR_GREATER
+            content.JsonWriter.WriteRawValue(value);
+#else
+            JsonSerializer.Serialize(content.JsonWriter, JsonDocument.Parse(value).RootElement);
+#endif
+            return content;
+        }
     }
 }

sdk/core/Azure.Core/tests/RequestContentHelperTests.cs

@@ -27,6 +27,16 @@ public static IEnumerable<TestCaseData> GetOneDateTimeData()
             yield return new TestCaseData(DateTimeOffset.Parse("2022-08-26T18:38:00Z"));
         }
 
+        public static object[] BinaryDataCases =
+        {
+            new object[] { BinaryData.FromString("\"test\"") },
+            new object[] { new BinaryData(1)},
+            new object[] { new BinaryData(1.1)},
+            new object[] { new BinaryData(true)},
+            new object[] { BinaryData.FromObjectAsJson(new {name="a", age=1})},
+            new object[] { new BinaryData(DateTimeOffset.Parse("2022-08-26T18:38:00Z"))}
+        };
+
         [TestCase(1, 2)]
         [TestCase("a", "b")]
         [TestCase(true, false)]
@@ -186,5 +196,16 @@ public void TestFromObject<T>(T value)
                     break;
             }
         }
+
+        [TestCaseSource(nameof(BinaryDataCases))]
+        public void TestFromObjectForBinaryData(BinaryData value)
+        {
+            var content = RequestContentHelper.FromObject(value);
+            var stream = new MemoryStream();
+            content.WriteTo(stream, default);
+            stream.Position = 0;
+            var document = JsonDocument.Parse(stream);
+            Assert.AreEqual(value.ToObjectFromJson(), BinaryData.FromString(document.RootElement.GetRawText()).ToObjectFromJson());
+        }
     }
 }